The raw data is formatted for transmission by hand, so has to be decrypted using “expert system”
techniques. Extensive manual correction capabilities are also provided. All data input is
subjected to elaborate and comprehensive checks for content, validity, and credibility prior
to its being accepted and stored in an SQL database.

Wind speed advisory messages are then constructed to make the information available to the flight
data processing systems. These are transmitted at appropriate times, via a special communications
controller; with every message being checked and positively acknowledged by the mainframe system.

In order to meet the stringent safety standards the CAT system includes : -